#include<bits/stdc++.h>
#define ios ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0)
#define debug  freopen("in.txt","r",stdin),freopen("out.txt","w",stdout);
#define fs first
#define sc second
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
const int maxn = 1e6+10;
using namespace std;

int N,W;
int w[maxn],v[maxn];
ll dp[maxn];
int main(){
    // debug;
    ios;
    
    cin>>N>>W;
    for(int i = 1;i<=N;i++) cin>>w[i]>>v[i];
    for(int i = 1;i<=N;i++){
        for(int j = W;j>=w[i];j--){
            dp[j] = max(dp[j],dp[j-w[i]] + v[i]);
        }
    }
    cout<<dp[W]<<'\n';
        
    return 0;
}
